# CVE-2026-29642

> Vulnerability · severity: **HIGH** (CVSS 7.8).

## Description

A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as "writes preserve values, reads ignore values," i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.

## Key facts

- **CVE ID:** CVE-2026-29642
- **Published:** 2026-04-20
- **CVSS severity:** HIGH
- **CVSS base score:** 7.8
- **CWE codes:** CWE-1244

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29642

## Citation

> AI Analytics. CVE-2026-29642. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-29642. Derived from NIST NVD. Licensed CC0.

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